What is the general equation of spheres?

Answer 1

If you are talking about the volume, then the equation is (4/3)πr^3

Or in English it is four-thirds times pi times the radius cubed.

The surface area is 4πr^2, or four time pi time the radius squared.

The equation that describes a sphere centered in the origin is x2 + y2 + z2 = r2. If the center is at coordinates (a, b, c), then the equation is (x-a)2 + (y-b)2 + (z-c)2 = r2